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学科主题: 地球科学::地质学
题名: Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China
作者: Song, CH (Song, Chunhui)1, 2; Zeng, YY (Zeng, Yongyao)1, 2; Yan, MD (Yan, Maodu)3, 4; Wu, S (Wu, Song)1, 2; Fang, XM (Fang, Xiaomin)3, 4; Bao, J (Bao, Jing)1, 2; Zan, JB (Zan, Jinbo)3, 4; Liu, XF (Liu, Xifang)5, 6
通讯作者: Song, CH
关键词: POLARITY TIME-SCALE ; RESOLUTION MAGNETO STRATIGRAPHY ; NE TIBETAN PLATEAU ; TECTONIC EVOLUTION ; NORTHERN TIBET ; QUIET ZONE ; DINOFLAGELLATE CYSTS ; QINGHAI PROVINCE ; COLLISION ; GROWTH
刊名: GEOPHYSICAL JOURNAL INTERNATIONAL
发表日期: 2016
DOI: 10.1093/gji/ggw199
卷: 206, 期:3, 页:1847-1863
收录类别: SCI
合作性质: 国际
文章类型: Article
部门归属: 碰撞与隆升
英文摘要: A series of important geological events occurred in the Tibetan Plateau area during the Jurassic, such as the collision of the Lhasa and Qiangtang Terranes, the closure of the Meso-Tethyan Ocean, the opening of the Neo-Tethyan Ocean and the cessation of the mega-monsoon. The similar to 3000 m thick Jurassic sedimentary sequence in the Qiangtang Basin on the central Tibetan Plateau, which is called the Yanshiping (YSP) Group, recorded these geological events. However, the chronology of the sequence is surprisingly poorly constrained. Here, we perform a detailed palaeomagnetic analysis on the similar to 1060 m thick middle and upper portions of the YSP Group (the Xiali and Suowa Formations) in the YSP section of the eastern Qiangtang Basin. Three bivalve zones at stratigraphic intervals of similar to 40-140, 640-800 and 940-1040 m are identified, which yield a Bathonian-Callovian age for the Lower Xiali Fm., a Callovian-Oxfordian age for the Lower Suowa Fm. and an Oxfordian-Kimmeridgian age for the Upper Suowa Fm. A total of 544 oriented palaeomagnetic samples were collected from the section. By combining thermal and alternating field demagnetizations, clear characteristic remanent magnetization (ChRM) directions are isolated for most of the samples. The robust ChRM directions pass fold and reversals tests, which support the primary nature of the ChRMs and yield a palaeopole at 76.8A degrees N/297.2A degrees E (dp = 2.2A degrees, dm = 3.7A degrees). A total of 27 normal and 26 reversed polarity zones were successfully recorded in the section. Combined with fossil age constraints, results suggest that the section is plausibly composed of a Callovian-Early Kimmeridgian age sedimentary sequence.
语种: 英语
WOS记录号: WOS:000384650400028
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7611
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
2.Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
5.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
6.Minist Land & Resources, Key Lab Saline Lake Resources & Environm, Beijing 100037, Peoples R China

Recommended Citation:
Song, CH ,Zeng, YY ,Yan, MD ,et al. Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2016,206(3):1847-1863.
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